Terra Environment Dictionary — T

Terra Environment Dictionary is a resource of words, terms and phrases related to environmentalism, as defined by society.

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The hypothetical process of engineering the environment (of a planetary or celestial body) to make it capable of supporting life, sometimes more specifically that of humans.
Mars is often touted as the best option (outside of Earth itself) for terraforming, due to its relative proximity to Earth (reducing the extent of space travel required), the presence of water and its geological history which suggests that the planet once had a dense atmosphere similar to Earth’s.
The most pressing reasons for terraforming include the over-utilisation and exhaustion of Earth’s resources, unsustainable global warming and climate change, and human overpopulation.
The idea of terraforming, is however, just that—an idea. Questions surrounding its feasibility (current technologies are inadequate and at least centuries away from terraforming), ethics, and costs present the most pertinent obstacles.
Of course, regardless of all these, remain one obvious yet seemingly ignored flaw: if we can’t even remove carbon dioxide from Earth’s atmosphere, how are we ever going to overcome the way more monumental geoengineering required to terraform Mars?


A common name for saltwater fish of the tribe Thunnini, under the family Scombridae. Tuna is usually caught in the wild, and a very small percentage that is farmed, for human consumption, both of which are detrimental to the environment.
Tuna fishing is usually done through longline fishing, sometimes aided by fish aggregating devices (FADs) that artificially attract pelagic fish species, both of which results in high rates of bycatch. Practically all species of wild tuna are also threatened by overfishing. As predator species, the dwindling number of tuna leads to an explosion of population growth of prey species, which may cause overgrazing and thus the destruction of marine habitats.
Tuna farming, used only for the Atlantic bluefin tuna, is done through two ways: the first is through catching juvenile fish from the wild, before penning and fattening them up—which doesn’t lower the threat of overfishing or bycatch. The second, more difficult, way is to fully farm tuna by raising them through the entire life cycle from eggs to adulthood and reproduction. While this is the more sustainable option, the problems of farming tuna still apply. Tuna need to consume 15 kilograms of fish feed (prey species that usually need to be caught from the wild, again resulting in bycatch and overfishing), just to gain one kilogram in weight.

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